Basic Concepts A hierarchical database consists of a collection of records which are connected to one another through links a record is a collection of fields,each of which contains only one data value. A link is an association between precisely two records. The hierarchical model differs from the network model in that the records are organized as collections of trees rather than as arbitrary graphs. Database System Concepts,5th Ed. B.2 @Silberschatz,Korth and SudarshanDatabase System Concepts, 5 B.2 ©Silberschatz, Korth and Sudarshan th Ed. Basic Concepts A hierarchical database consists of a collection of records which are connected to one another through links. a record is a collection of fields, each of which contains only one data value. A link is an association between precisely two records. The hierarchical model differs from the network model in that the records are organized as collections of trees rather than as arbitrary graphs